Pressure-gage.



w. P. & T. A, HAMMOND.

PRESSURE GAGE.

APPLICATION FILED APR.29. l'910.

Patented May 2, 1916.

'iil* @XL1/bm @com barium uml-@E WJELLIAIVI P. HAMMOND.AND THEODORE A.HAMMOND, OF PASSAIC, NEW JERSEY, ASSIGNORS TO A. SCHRADERS SON,INCORPORATED, OF NEW YORK, N. Y., A

CORPORATION OF NEW YORK.

PRESSURE-GAGE.

,This invention' relates to new and useful improvements in gages,particularly intended to indicate fluid pressure, and more particularlyto a coupling or connectmg means for gages.

The invention has for an object to provide .in conjunction with a gagenovel coupling or induct pieces in order to facilitate the applicationof the gage to the receptacle to be charged or inflated under pressure.

With the above and other objects in view, the invention consists in thedetail of construction, and in the novel combination of parts to behereinafter referred t;

In describing the invention, reference will be had to the accompanyingdrawing forming part of this specification, wherein like characters ofreference denote corresponding parts in the several views, and in Which-Figure 1 is a longitudinal sectional view of the gage embodying theinvention. Fig. 2 is a view partly in elevation and partly in sectionillustrating one form of coupling piece. Fig. 3 is 4a view in elevationof the complete gage shown in Fig. l. Fig. l is av longitudinalsectional view of another form of coupling piece. A

lln the drawings, -1- denotes a barrel or cylinder closed at one end bythe head -2-, and at the opposite end by the head The head 2- isprovided with a stem -4- in which is provided a check valve -8- of anysuitable construction which will open to admit air to be forced into orthrough the device, but which prevents a reiuX of the air.

Carried by the stem -4- and forming a continuation thereof is a tube orduct -19- Specification of Letters Patent.

Patented May 2, 191W.

' Application led April 29, 1910. Serial No. 558,413.

which passes through the Abarrel -1-. The barrel -ltelescopes into ashell or jacket --5-.-, which is formed with closed end f5- the oppositeend being open. The tube or duct -19- is surrounded by a stem -9, thebore of the stem -rforming l about the tube -19 a pressure duct -10-.This stem -9- projects through the closed .end -.6- of the jacket -5,and sald projected portion -11 is screwthreaded eXteriorly invorder thatit may be i connected to the valve stem of the receptacle to be infiatedif desired, but more particularly to the coupling pieces to be referredto. The stem 9- is held against displacement by the disk 12- which islocked to the closed end -6- of the jacket -5 by the binding screws -l3.Near its outer end or the end adjacent the head -2- the stem -9- isprovided with a head -14--, which bears against the inner wall of thebarrel 1- and forms a pressure-head. Between the. heads-S- and -l4 isarranged a hel1ca1 spring -1'5-, which holds the heads and 14- normallyin close proX- imity oneto the other.

T he jacket -15- is provided adjaccn lts lnner lor closed end -3- with alongitudinal slot 1G- and the exterior surface of the jacket along oneedge of the slot 1s marked with a scale or graduation -17 indicatingvarious degrees of air pressure in pounds per square lnch or othersuitable measure of pressure. The barrel -1- is provided with theencircling mark -18- which forms anindeX indicating on the scale thedegree of air pressure as the graduations come into registry therewith.

As above described, thedevice may be employed as a gage without theautomatic blow-off or relief feature.

In the operation of the foregoing, the projected portion -11- of thestem -9- is attached to the valve stem or casing of the receptacle to becharged or inflated. At this point, particular attention is directed tothe cross-bar or pin 20 intersecting the bore of the projected portion-1l-. This bar or pin -20- is intended to contact 4with to depress andopen the valve in the said valve stem as is believed to be apparent. Ifthere be any a1r pressure in the receptacle,

this pressure will be communicated through l suitably coupled to thestem and air is forced through the duct and the pressure of the air willbe indicated in like manner. As the pressure in the barrel rises, thebarrel moves outwardly, the spring -l5*-, retracting the barrel as thepressure decreases.

It will be seen that the jacket -5- may be rotated independently of thevarious parts of the gage so that the scale 17- may be brought into anyposition most convenient for reading without interfering with theconnecting of the devicel with the valve-stem of the receptacle, theencircling mark -l8- permitting such reading. Another mode of use is toconnect the 4same to one branch of a multiple branched connector as isshown in the drawings, whereupon the inflation pump may be connected tothe free end of said connector and the pressure gage caused to performthe added function of a pressure limiting device in the followingmanner: In order to automatically relieve the pressure after apre-determined pressure `has been obtained, the shell or jacket '5* isembraced by a jacket -21-,`

which has its outer end closed as shown at -22-- Centrally of thisclosed end -22-, is arranged the pin -23-, threaded therethrough toproject within the jacket -21-. Should it be desired to inflate a'receptacle to 30'pounds, the free or inner edge 2dof the jacket isbrought into alinement with the -30- indication of the sca'le -17-, andthe jacket -21- is then locked against movement by the clamping nut 2G-threaded to the stem -25-, projecting from the jacket -5- and passingthrough the slot *27- formed in the jacket -21-. As the pressure causesthe barrel 1- to move outwardly, the pin 23.- will contact with anddepress the valve- -8- as soon as the mark -l8- of the barrel 1- passesthe -30- indication of the scale -17--. This will permit the escape ofthe air or fluid, communication being had with the atmosphere throughthe opening '-28- in the end -22- of the jacket. `Thevpin -23- isthreaded into place in order that a proper adjustment of the pin with'relation to the stem of the valve -8- may be had to assure a properoperation of the device.

For convenience of attachment to a receptacle, more especially to apneumatic tire, when applied, either of the coupling pieces or inductcouplers shown in the drawings may be employed. The coupler-29 isarranged at right angles to the gage, and is provided with a centralbore -30- having located in one end the check valve -31, to permit theforcing of air therethrough, but preventingA the exit of air. Theopposite end of the coupling is provided with a nipple -32- forconnection with the valve stem of the receptacle, and may be of anydesired construction. The bore of the nipple is intersected by the pinor bar S3- for the same purpose as specified with relation to the pin20- The coupler piece -29- is provided with a boss 34- having a bore B5-which may be provided with a check valve if desired similar to checkvalve 31. Such a form is shown in Fig. 2. The bore -35- is adapted toregister with the bore of the projection -11 of the stem 9. In order toafford such registry, the free end of the bore is provided withathreaded recess fo-r the reception of the projected portion l1-. Bore-35- of the boss conimunicates with the bore -30-.

The operation of the device with the coupler piece attached, is thoughtto be obvious. In applying the gage, it is believed to be apparent thatthe pulsating pressure of the pump is delivered directly into thereceptacle. The gage is therefore affected by the still pressure in thereceptacle. The coupler piece shown in Fig. Q of the drawing is providedwith an enlarged central portion or chamber -36-.

The coupling piece shown in Fig. 4 comprises a plurality of branches37-, each branch being provided with an inwardly opening check valve 38hin its passageway, similar in construction to valves -8- and -31-heretofore described. The coupler is also provided with a nipple -39-which is provided with a valve opener similar to that shown at 2O inFig. 1, for connecting the device to the valve stern casing of the tire.This form of connecting piece shown in Fig. 4L- enables the pump to beattached to one branch, a pressure gage to another branch, and permitsthe release of an excess o-f pressure upon the tire or receptacle towhich it is attached by the depression or 'opening of the valve in theremaining or other branch.

When instantaneous gages are used, that is, gages that are not coupledpermanently and directly to the valve casing, but are merely heldagainst the valve casing for a sho-wn in Fig. *land use but twovbranches, one to which the pump connection is applied, and the other forthe momentary application of the gage and the release of an excessivepressure when required.

While we have illustrated a preferred form of pressure gage coupling, wewould have it understood that we are not limited to the details ofconstruction shown and described, as the same may be varied and stillcome Within the ,scope and tenor of the appended claims.

The pressure gage per Se is claimed in our application, Serial No.58,887, led @ctober 30, 1915. y

The construction of coupling having means adapted to be operated to ventair while a gage is applied to the coupling, as shown for example inFig. 4, is not claimed specifically' herein, but forms thesubject-matter of our divisional application Serial No. 84,276, filedMarch 15, 1916.

Having thus described' our invention, whatwe desire to secure by LettersPatent is,

1. In combination with a gage, an attaching device therefor, providedwith a plurality of branches; check valves in said branches, and meansfor coupling the device to the valve casing of a pneumatic tire, and

means for establishing open communicationy with the interior of the tirein the act of applying the device to the valve casing.

2. In combination with a gage, an attaching device therefor, comprisinga body provided with passageways; check valves positioned in two endportions of the device, and an attaching nipple in the other end portionof the device, and means consisting of a rigid pin for engaging anddepressing the valve of a pneumatic tire, and opening communicationbetween the passageways and the interior of the tire in the act ofapplying the device to the valve casing of the tire.

3. In combination with the valve casing of a pneumatic tire, aconnecting device 'comprising a body portion having a plurality ofcommunicating passageways; check valves in said passageways; a couplingnipple carried by the body portion; and means for automaticallydepressing the valve of the valve casing in the act of applying thedevice thereto.

4. In combination with a pneumatic tire, a gage and a source offluid-supply; a detachable connecting device consisting of a bodyportion'provided with a\plurality of passageways adapted tb establishcommunication between a tire, jgage, and source of fluid-supply; aplurality of check valves in said passageways, and an attaching nipplecarried by said device, provided with means for depressing the valve ofthe tire in order that the pressure therein may be indicated on thegage.

5. lIlhe combination, in an inflation connection for pneumatic tires, ofa triplebranched tubular body, one branch thereof being provided with avalve opening element and a valve nipple coupling, and each of theAother branches being provided with an inwardly opening valve.

6. 'Ihe combination of a pressure gage, means for supplying compressedgas, a conduit having terminals adapted to be connected one with saidpressure gageand the other with said means, a valve in the pressure gageterminal, and means carried by said pressure gage for automaticallyopening said valve when said pressure gage is connected to saidterminal.

7. 'Ihe combination of a pressure gage, means for supplying compressedgas, a conduit adapted to be attached to a pneumatic tire valve andhaving means for unseating the valve member therein, and also havingterminals adapted to be connected one with said pressure gage and theother with said gas supplying means, valves in said terminals and meanscarried by said pressure gage for automatically unseating the valve inthat terminal with which it is connected.

8. A device of the character described having three branches, the firsthaving means for connection with a gage, the second having means forconnection with a pump or the like, and the third having means forconnection with a tire valve, and an automatic check valve in saidiirstnamed branch.

9. A coupling device having a plurality of openings, one for connectionwith a gage and one for connection with a tire valve, and an automaticcheck valve locatedin said device near the point of connection with thegage and adapted to be closed when the gage is removed.

10. A device of the character described having three branches, the iirsthaving means for connection with a gage, the 'second having means forconnection with a pump or the like, and the third having means forconnection with a tire valve, and a valve in said first-named branch.

11. iIn a device of the character described, the combination of a parthaving a means for connection with a gage, a check valve in said part,agage having means for unseating said valve, said part having also meansfor engaging a tube or the like, and means for engaging a tire valve orthe like, said last-named means having a delater for unseating the tirevalve.

12. A coupling of the character described having a plurality ofpassageways greater said nipple being of substantially the same diameteras said tire valve.

XVILLIAM P. HAMMOND. THEODORE A. HAMMOND.

In presence of- E. C. RYDER, P. FRANK DONNELL.

